JP2018072584A - Acoustic visualization device and acoustic visualization method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic visualization device and an acoustic visualization method that generate a surface gravity wave on a still water surface, and that can visually represent music by means of the surface gravity wave.SOLUTION: There is provided an acoustic visualization method in which: acoustic wave signals of a sound source 40 are amplified to drive a vibration generator 30 and its vibration is transferred through a vibrator 20 to a still water surface to vibrate the still water surface so as to generate a surface gravity wave w on the water surface; and an acoustic wave signal having a frequency more than or equal to a predetermined frequency among the acoustic wave signals is amplified to be larger than the acoustic wave signal having a frequency less than the predetermined frequency. Thus, since an interference wave W that is generated by an interference with the surface gravity wave w due to other sound produced at the same time is made to be large and visibility is improved, visualization of music is enabled.SELECTED DRAWING: Figure 1

Description

  The present invention is installed in a place where many people gather, such as a hotel lobby, a courtyard of a building, a public space, etc., and generates surface gravity waves linked to music flowing in the place on the still water surface of the aquarium. The present invention relates to an acoustic visualization device and an acoustic visualization method capable of visually expressing music according to shape, size, generation timing, and the like.

  In places where many people gather, such as hotel lobbies in urban areas, courtyards of buildings, public spaces, etc., there are exhibits and structures on the waterfront such as aquariums, artificial ponds, and fountains. There are many cases. Exhibits and structures on the theme of waterside are said to have a so-called relaxation effect, and are used not only in parks but also in many indoor facilities in cities with little nature. However, these static exhibits tend to fade with time and tend to get tired. On the other hand, since the installation cost is high, it is difficult to replace it frequently, and it is possible only to devise lighting and arrangement at best.

  For this reason, for example, Patent Document 1 below proposes a ripple generator in which a vibrating body such as a speaker is installed in a water tank and a plurality of human sensors are installed in the vicinity thereof. According to this apparatus, when the person detecting sensor detects a person approaching, a sound is emitted from a speaker close to the person detecting sensor, and at the same time, the vibration is transmitted to the water surface to generate a ripple just above it. These ripples are also generated from other speakers detected by other human sensors, and these ripples are used to produce interpersonal communication by visually expressing the interference state on the water surface. is there.

Japanese Patent Laid-Open No. 2001-13899

  By the way, as a result of many years of trial and error about whether the music can be expressed visually so that hearing-impaired people can enjoy music, the inventor cannot use the water surface gravity wave generated on the still water surface by vibration based on sound. I came up with the idea of heels. However, just transmitting the vibration generated by the speaker to the still water surface as in Patent Document 1 above, the harmony (chord) in which a plurality of sounds overlap each other regardless of the rhythm (rhythm), or the melody in which the sound changes continuously ( It has proved difficult to express the melody visually.

  Therefore, the present invention has been devised to solve these problems. The purpose of the present invention is to generate surface gravity waves on the hydrostatic surface, and to change the rhythm according to the shape and size of the surface gravity waves, the generation timing, etc. The present invention provides a novel acoustic visualization apparatus and acoustic visualization method capable of visually expressing not only harmony and melody music.

  As described above, when the music is visualized using the waves generated on the water surface along with the vibration of the sound, the inventor simply transmits the vibration generated by the speaker to the water surface as in Patent Document 1, and the rhythm (rhythm) ) Is also not faithful, and it has proved difficult to visually express harmonies (chords) in which multiple sounds overlap and melodies (melody) in which sounds change continuously.

  This is because the music itself is a combination of various scales, that is, sounds of various frequencies (from low to high) flow simultaneously or continuously. Of these, sounds in the low frequency range, for example, low frequencies having a frequency of 200 Hz or less. Although it is relatively difficult to hear, the vibrational energy based on the sound is large and the wavelength is long, so that the water surface can be efficiently waved. On the other hand, although high frequency sound, for example, high frequency exceeding 200 Hz is easy to hear in the air, the vibration energy based on the sound is small and the wavelength is short, so even if the vibration is transmitted to the water surface, the viscosity of water It was found that the water surface can hardly be waved. Therefore, in the case of harmony (chord), only the wave corresponding to the low tone can be recognized, and in the case of the melody (melody), since the wave corresponding to the high tone is hardly generated, it is difficult to visually confirm this. .

  In addition, these sounds are ripples centering on the sound source (vibration source) in contact with the water surface and spread radially around them. However, when sounds (vibration) of different frequencies are added simultaneously, depending on the combination It was found that an interference wave was generated, and the interference wave did not spread radially, but remained at the generation position or moved slowly enough to be clearly visible. In other words, it was found that this interference wave moves at a much slower speed than the speed of a surface gravity wave of a certain frequency, or is generated in a state where it stops. And this interference wave is much higher than other sound waves and has excellent visibility, so not only surface gravitational waves but also unprecedented music using this interference wave. It became clear that it became possible to visualize.

  Accordingly, in order to solve the above problems, the first invention provides a vibrator that generates vibrations on the hydrostatic surface of water stored in a water tank and generates surface gravity waves on the water surface, and imparts musical vibrations to the vibrator. A vibration generator, a sound source that supplies an acoustic wave signal that drives the vibration generator, an amplification circuit that amplifies the acoustic wave signal of the sound source and supplies the acoustic wave signal to the vibration generator, and the acoustic wave signal to be amplified Among these, an acoustic visualization apparatus is provided that includes an equalizer that amplifies an acoustic wave signal having a predetermined frequency or higher than an acoustic wave signal having a frequency lower than the predetermined frequency.

  According to such a configuration, an acoustic wave signal having a predetermined frequency or higher, that is, an acoustic wave corresponding to a high sound can be amplified to generate a surface gravity wave corresponding to a high sound on the water surface. Since the surface gravity wave corresponding to the high sound and the surface gravity wave corresponding to the low sound interfere with each other, a large interference wave is generated. Therefore, the music can be visualized using the interference wave.

  A second invention is the acoustic visualization apparatus according to the first invention, wherein the predetermined frequency is 200 to 500 Hz. By amplifying an acoustic wave signal of 200 to 500 Hz or more in this way, surface gravity waves for high sounds are easily generated, so that interference waves can be generated efficiently.

  According to a third aspect of the present invention, there is provided a vibrator for applying vibration to a hydrostatic surface of water stored in a water tank to generate surface gravity waves on the water surface, a vibration generator for imparting music vibration to the vibrator, and the vibration generation. A sound source that supplies an acoustic wave signal for driving the sound generator, an amplifier that amplifies the acoustic wave signal of the sound source and supplies the sound wave generator to the vibration generator, a differentiation circuit that differentiates the acoustic wave signal to generate a differential wave signal; An acoustic visualization device characterized by comprising:

  When the acoustic wave signal is differentiated in this way, the amplitude of the differentiated wave does not change and only the wavelength becomes shorter and the waveform becomes steeper as the frequency becomes higher. Since the surface gravity wave having the same size as that in the case can be generated, the interference wave having excellent visibility can be generated efficiently.

  According to a fourth invention, in any one of the first to third inventions, a light source that irradiates light on the water surface of the aquarium from below or above, and a wave image of light passing through the water surface from the light source. An acoustic visualization device further comprising a screen for projection. According to such a configuration, not only the surface gravity wave generated on the water surface of the water tank is directly seen, but also light is irradiated from below or above the water surface of the water tank, and the wave image of the light passing through the water surface is screened. By projecting on the screen, you can show it to other people and more people. Furthermore, by changing the color of the light, the irradiation method, etc., it becomes possible to produce a more fantastic and artistic effect.

  The fifth invention amplifies the acoustic wave signal of the sound source to drive the vibration generator, transmits the vibration of the vibration generator to the still water surface through the vibrator, vibrates the still water surface, and An acoustic visualization method for generating a surface gravitational wave at the time of amplifying the acoustic wave signal, wherein an acoustic wave signal having a predetermined frequency or higher is larger than an acoustic wave signal having a predetermined frequency or less. An acoustic visualization method characterized by amplifying. According to such a method, the same operation and effect as the first invention can be obtained.

  The sixth invention amplifies the acoustic wave signal of the sound source to drive the vibration generator, transmits the vibration of the vibration generator to the hydrostatic surface through the vibrator, vibrates the hydrostatic surface, and An acoustic visualization method for generating a surface gravitational wave, wherein the acoustic wave signal is differentiated to sharpen the waveform. According to such a method, the same operation and effect as the second invention can be obtained.

  According to the present invention, an acoustic wave signal having a predetermined frequency or higher, that is, a wave corresponding to a high sound is amplified to a level that can be visually recognized, or the acoustic wave signal is differentiated to sharpen the waveform to increase the sound. Corresponding surface gravity waves can be generated on the water surface. In addition, since the interference wave generated by interference with a wave caused by another sound generated at the same time is increased and the visibility is improved, music can be visualized.

It is a block diagram which shows one Embodiment of the acoustic visualization apparatus 100 which concerns on this invention. 3 is a perspective view illustrating an example of a vibrator 20. FIG. 6 is a conceptual diagram showing a state in which an interference wave W is generated on the water surface due to the vibration of the vibrator 20. FIG. FIG. 6 is a perspective view showing another embodiment of a vibrator 20. FIG. 6 is a perspective view showing another embodiment of a vibrator 20. 4 is an explanatory diagram illustrating an example of a vibrator 20 attached to a vibration generator 30. FIG. 4 is a plan view showing a state in which an interference wave W is generated on the water surface due to the vibration of a vibrator 20. FIG. It is a flowchart figure which shows the flow of the process by the acoustic visualization apparatus 100 which concerns on this invention. It is explanatory drawing which shows the relationship between an acoustic wave and its frequency. It is explanatory drawing which shows the interference wave W produced | generated by the low frequency surface gravity wave w1 and the high frequency surface gravity wave w2. It is explanatory drawing which shows the relationship between an acoustic wave and its differential wave. It is a flowchart figure which shows the flow of the process by the acoustic visualization apparatus 100 which concerns on this invention. It is explanatory drawing which shows the application example of the acoustic visualization apparatus 100 which concerns on this invention. It is a perspective view which shows other embodiment of the water tank. It is a perspective view which shows other embodiment of the water tank. It is a perspective view which shows other embodiment of the water tank.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of an acoustic visualization apparatus 100 according to the present invention. As shown in the figure, the acoustic visualization apparatus 100 includes a water tank 10 in which water is stored, a vibrator 20 that is positioned in contact with the hydrostatic surface of water stored in the water tank 10, and vibrations applied to the vibrator 20. The vibration generator 30 to be applied, the sound source 40 that supplies the acoustic wave signal that drives the vibration generator 30, and the amplifier 50 that amplifies the acoustic wave signal of the sound source 40 and supplies it to the vibration generator 30. It is configured.

  The water tank 10 is not particularly limited as long as it can hold a liquid such as water and can be easily visually recognized from the surroundings. It is desirable to support a cylindrical transparent acrylic container 11 with a plurality of legs 12. Moreover, although the magnitude | size of the container 11 etc. are not specifically limited, For example, the height of a water surface is about 30 cm-50 cm from the ground, and a diameter is about about 50 cm so that a small child can see the water surface.

  The liquid stored in the aquarium 10 is preferably colorless, transparent and harmless water such as tap water, but other than that, seawater and other liquids can also be used. May be colored in any color. Furthermore, an oil layer made of oil or the like may be formed on the water surface, or the oil layer may be mixed with a lipophilic fluorescent material or dyeing material to emit light or be colored.

As shown in FIG. 2, the vibrator 20 includes a vibrating part 21 that comes into contact with the hydrostatic surface of the water tank 10 and a support rod 22 that supports the vibrating part 21 from above. The vibration unit 21 is not particularly limited as long as it has rigidity (3 to 9 × 10 Pa) that can transmit vibration in the acoustic frequency range (80 Hz to several kHz) to the water surface. It is desirable to use a rod made of synthetic resin (polypropylene resin) having a triangular cross section as shown in FIG. The support rod 22 is also preferably made of a material having the same vibration transmission performance. When the speaker power is 3 w, about 20 g is desirable, and the area in contact with the water surface is desirably 1 cm ² or less.

  In addition to this form, the vibrator 20 has a spherical glass rod with a tip as shown in FIG. 4A, a glass rod with a sharp tip as shown in FIG. A glass rod having a branched tip as shown in FIG. Further, as shown in FIG. 5, a linear object such as a wire may be processed into a spiral shape, or may be an art work (the shape itself has a meaning) in which the linear object is processed into a flat shape. In the case of this linear vibrator 20, for example, it can be composed of a metal wire (stainless steel) having a thickness of 0.4 to 2 mm, and the spiral portion 20a is in contact with the surface of the water surface so as to float on the water surface. (0 to 3 mm). Two or more vibrators 20 can be used in combination.

  The vibration generator 30 converts an electrical signal related to sound (musical electrical signal) into mechanical longitudinal vibration, and is specifically composed of a directional speaker. For example, as shown in FIG. 6A, the support rod 22 of the vibrator 20 is attached to the diaphragm 31 of the directional speaker via a rubber pedestal 32, and the vibration of the diaphragm 31 is caused by the vibration of the rubber pedestal 32. And is transmitted to the vibrating portion 21 side through the support rod 22.

  A commercially available speaker can be used as it is, and a product (FPS0202N3R2-3W-8Ω) manufactured by FPS Co., Ltd. was used for the effect experiment of the present invention. In the case of the linear vibrator 20, the end of the metal wire is inserted into the block-like hard rubber 33 attached to the diaphragm 31 as shown in FIG. It is done. In addition to the speaker, the vibration generator 30 can also use an element that converts an electrical acoustic signal into mechanical vibration, such as Giant Magnetostrictive Material (GMM exciter: manufacturer Jigbo Co., Ltd.), commonly known as GMM. .

  Returning to FIG. 1, the sound source 40 generates an acoustic wave signal of music, and specifically comprises a known product such as a digital audio player (DAP) such as a CD player, a DVD player, or an MP3 player. Further, the sound source 40 may be an analog sound source such as a record board or a magnetic tape, and may further collect actual live performances, singing, animal calls and the like with a microphone. Alternatively, the sound source file recorded on the PC may be reproduced and output in analog.

  The amplifier 50 includes an amplifier circuit 51 that amplifies the acoustic wave signal, and an equalizer (acoustic device) 52 that changes the frequency characteristics of the acoustic wave signal. The amplification circuit 51 amplifies a weak acoustic wave signal sent from the sound source 40 to such an extent that the vibration generator 30 can be driven. When the sound source is digital, digital amplification and digital-analog (D / A) Its function is demonstrated by conversion. When the sound source is analog, a sound source having an analog-digital (A / D) conversion function is used before digital amplification.

  The equalizer (acoustic device) 52 has a function of selectively amplifying a predetermined frequency band among a plurality of bands of an acoustic frequency in a range of several tens Hz to several tens kHz amplified by the amplifier circuit 51. The equalizer 52 has a function of further selectively amplifying an acoustic wave signal in a high frequency band of at least 200 to 500 Hz or more among the amplified acoustic frequencies and outputting the amplified signal to the vibration generator 30. A commercially available equalizer 52 can be used as it is, and a product (TenBandGraphicEQ M108) manufactured by Moridaira Co., Ltd. was used for the effect experiment of the present invention.

  Next, an example of an acoustic visualization method (action) by the acoustic visualization apparatus 100 according to the present invention having such a configuration will be described. First, as shown in the flow of FIG. 8, the wideband acoustic wave signal generated from the sound source 40 is amplified (primary amplification) over the entire area by the amplifier circuit 51 of the amplifier 50, and the amplified acoustic wave component Among them, an acoustic wave signal in a high frequency band of 200 to 500 Hz or more is further selectively amplified (secondary amplification) by the equalizer 52. The acoustic wave signal amplified by the amplifier 50 is sent as an analog electric signal to a vibration generator (directional speaker) 30 to drive it and generate mechanical longitudinal vibration along with sound.

  The longitudinal vibration generated by the vibration generator 30 is transmitted to the vibrator 20 and vibrates. When the vibrator 20 vibrates, as shown in FIG. 2 and FIG. 7, a vibrating part 21 in contact with the hydrostatic surface vibrates the hydrostatic surface, and a surface gravity wave w having this as a generation source is generated. The surface gravitational wave w forms a ripple that spreads radially on the water surface around the vibrating portion 21, but what is visible is a low frequency (low sound) of 200 to 500 Hz or less. It is difficult to visually recognize the surface gravity wave w corresponding to a high frequency (high sound) of 200 to 500 Hz or higher.

  This is because, as shown in FIG. 3A, in the case of a low frequency band (bass), vibration energy based on the sound is large and the wavelength is long, so that the water surface can be efficiently waved. As a result, a surface gravity wave w having a size that can be visually recognized with the naked eye is generated. However, the wavelength is 10 cm to 0.1 cm, the wave moving speed is 18 cm / sec to 1 cm / sec, and the ripple spreads and disappears instantly. It is difficult to express.

  As shown in FIG. 3B, in the case of a high frequency range (high sound), although it is easy to hear in the air, the vibration energy based on the sound is small and the wavelength is short, so that the vibration is transmitted to the water surface. However, the water surface can hardly be waved due to the viscosity of water, and even if a surface gravity wave w is generated, it is difficult to visually recognize it. This is because, as shown in FIG. 9A, the amplitude (wave height) y indicating the magnitude of vibration energy of the sound becomes smaller as the frequency becomes higher (the wavelength becomes shorter).

  Therefore, in the acoustic visualization apparatus 100 of the present invention, as shown in FIG. 5B, an acoustic wave in a high frequency range of about 200 Hz or more where the amplitude (wave height) y is small is amplified, and the amplitude (wave height) y is small. As shown in FIG. 10, interference waves W are generated concentrically and multiply at the positions where the waves having the frequency of the chord intersect. Moreover, since the interference wave W has a high wave height y, the interference wave W can be clearly recognized visually, and is also stopped at the position or seems to move slowly.

  The size, generation position, timing, generation time, and the like of the interference wave W slightly change depending on the nature of the vibration, that is, the rhythm (rhythm), harmony (chord), and melody (melody) expressed by the acoustic wave signal. . For example, the interference wave W of 440 Hz and 880 Hz corresponding to a chord occurs in a state where it is almost stopped. Therefore, it is possible to visualize complicated music by generating the interference wave W together with the surface gravity wave w that can be visually recognized.

  In addition to the method of amplifying a high-frequency acoustic wave signal with the equalizer 52 as described above, the interference wave W is generated by the differential circuit 53 such as an operational amplifier for the entire acoustic wave that is primarily amplified by the amplifier circuit 51. It is also possible to differentiate and drive the vibration generator 30 by the differential wave. That is, as shown in FIG. 11A, the acoustic wave signal in the audible range generated by the sound source 40 is usually composed of a sine wave of several tens of Hz to several tens of kHz. When this is differentiated by the differentiating circuit 53, FIG. As shown in (B), the amplitude (wave height y) does not change even when the sound becomes high. As a result, as the wavelength becomes shorter, the change in the waveform becomes steep, and as a result of this steepening, the same effect as that obtained by amplifying this in the high sound range as described above can be obtained.

  In addition, according to this differentiation process, a continuous linear process can be performed regardless of the frequency wavelength, so that a more natural interference wave W can be generated. When differentiating the entire acoustic wave amplified in this way, an operational amplifier differentiating circuit 53 is used instead of the equalizer 52 or together with the equalizer 52. Also, as shown in FIG. 12, the differential wave signal is generated by performing differential processing after or before amplification by the amplifier circuit 51 as shown in FIG.

  The acoustic visualization device 100 of the present invention configured as described above can be enjoyed by directly observing from the surroundings of the aquarium 10, but can be shown to more people at the same time by making full use of light such as illumination. In addition to being able to do it, it becomes possible to produce a more fantastic and artistic production. For example, as shown in FIG. 13, screens S1, S2, and S3 are respectively installed on the ceiling, wall surface, or floor surface of the room in which the water tank 10 is disposed, and light sources (irradiation lamps) L1 and L2 are disposed on the opposite sides. These light sources (irradiation lamps) L1 and L2 irradiate the water surface of the water tank 10 with light.

  Then, for example, when light is irradiated downward from the upper light source L1 to the water surface of the water tank 10, a part of the light is reflected by the water surface and reaches the screen S2 on the wall side, and the remaining light is It passes through the water surface and reaches the floor-side screen S3. Further, depending on the irradiation angle of light, it can be reflected on the screen S1 on the ceiling side. As a result, the interference wave W and the surface gravity wave w generated on the water surface are directly observed, and the wave image is also projected on the screens S1 to S3, so that the state of the change is simultaneously viewed by more people. be able to.

  This is the same when light is irradiated upward from the light source L2 located below the water tank 10 toward the water surface. Furthermore, if the color of the light from each of the light sources L1, L2 is changed, different light is irradiated alternately, or the brightness is changed with time, a more fantastic and artistic production can be performed. Is also possible.

  Alternatively, the wave image may be taken with a video camera or a digital camera from above or below the water surface, and the recorded image may be projected on the screen at a later date with a projector at the same time as the recording. Moreover, the shape of the water tank 10 is not limited to a simple cylindrical shape, and it is possible to make the shape easier to see by devising the shape. For example, as shown in FIGS. 14 and 15, if the bottom surface of the water tank 10 is inclined and the water surface is reflected on the bottom surface, a wave image generated on the water surface can be seen from the side surface. Furthermore, as shown in FIG. 16, it may be a water tank 10 that is placed directly on the ground for a small child.

DESCRIPTION OF SYMBOLS 100 ... Sound visualization apparatus 10 ... Water tank 20 ... Vibrator 21 ... Vibrating part 22 ... Support rod 30 ... Vibration generator 40 ... Sound source 50 ... Amplifier 51 ... Amplifying circuit 52 ... Equalizer 53 ... Differentiation circuit L1, L2 ... Light source S1, S2, S3 ... Screen W ... Interference wave w, w1, w2 ... Surface gravity wave

Claims (6)

A vibrator that generates vibrations on the hydrostatic surface of water stored in the aquarium and generates surface gravity waves on the water surface;
A vibration generator for applying vibration to the vibrator;
A sound source for supplying an acoustic wave signal for driving the vibration generator;
An amplifying circuit for amplifying the acoustic wave signal of the sound source and supplying it to the vibration generator;
An acoustic visualization apparatus comprising: an equalizer that amplifies an acoustic wave signal having a predetermined frequency or higher among the acoustic wave signals to be larger than an acoustic wave signal having a frequency lower than the predetermined frequency. The acoustic visualization device according to claim 1,
The acoustic visualization apparatus characterized in that the predetermined frequency is 200 to 500 Hz. A vibrator that generates vibrations on the hydrostatic surface of water stored in the aquarium and generates surface gravity waves on the water surface;
A vibration generator for applying vibration to the vibrator;
A sound source for supplying an acoustic wave signal for driving the vibration generator;
An amplifying circuit for amplifying the acoustic wave signal of the sound source and supplying it to the vibration generator;
An acoustic visualization apparatus comprising: a differentiation circuit that differentiates the acoustic wave signal to generate a differential wave signal. The acoustic visualization apparatus according to any one of claims 1 to 3,
A light source that irradiates light from below or above the water surface of the water tank;
An acoustic visualization device, further comprising: a screen that projects a wave image of light from the light source through the water surface. Amplifies the acoustic wave signal of the sound source to drive the vibration generator, transmits the vibration of the vibration generator to the hydrostatic surface through the vibrator, vibrates the hydrostatic surface, and generates surface gravity waves on the water surface An acoustic visualization method for
A method for visualizing an acoustic wave, comprising: amplifying the acoustic wave signal by amplifying an acoustic wave signal having a predetermined frequency or higher among the acoustic wave signals to be larger than an acoustic wave signal having a frequency lower than the predetermined frequency. Amplifies the acoustic wave signal of the sound source to drive the vibration generator, transmits the vibration of the vibration generator to the hydrostatic surface through the vibrator, vibrates the hydrostatic surface, and generates surface gravity waves on the water surface An acoustic visualization method for
An acoustic visualization method characterized by differentiating the acoustic wave signal to sharpen the waveform.

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